Geological and topographical atlas accompanying the report of the Geological Exploration of the Fortieth Parallel made by authority of the Hon. Secretary of War under the direction of Brig. and Brvt. Major-General A.A. Humphreys
"Geological and topographical atlas accompanying the report of the Geological Exploration of the Fortieth Parallel made by authority of the Hon. Secretary of War under the direction of Brig. and Brvt. Major-General A.A. Humphreys"@en
United States. Geological Exploration of the Fortieth Parallel.
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